Evaluation of Zn–Al–SO4 layered double hydroxide for the removal of arsenite and arsenate from a simulated soil solution: Isotherms and kinetics
Source abstract
Abstract
Abstract The main objective of the present study was to evaluate the effectiveness of synthetic Zn–Al–SO 4 layered double hydroxide (LDH) for the removal of arsenite and arsenate from a simulated soil solution. The Zn–Al–SO 4 was synthesized using a hydrothermal method and the adsorption of arsenic was studied using Langmuir and Freundlich models. Moreover, the kinetics of adsorption was tested using pseudo-first, pseudo-second, intraparticle diffusion and Elovich models. The results of the experiments revealed that the adsorption isotherms of arsenite and arsenate on the Zn–Al–SO 4 LDHs can be described well with Langmuir isotherm and maximum adsorption capacities were calculated to be 34.24 and 47.39 mg g − 1 for arsenite and arsenate, respectively. The adsorption kinetics of arsenate followed pseudo-second order while arsenite uptake showed better correlation with intra-particle diffusion model. Furthermore, the effects of two major coexisting and competing divalent anions such as SO 4 2 − and CO 3 2 − on the uptakes of arsenite and arsenate were studied and the results showed that CO 3 2 − had greater adverse effect on the uptakes of arsenite and arsenate by Zn–Al–SO 4 than SO 4 2 − . Based on X-ray diffraction results, the main underplaying adsorption mechanism of arsenite and arsenate might be the exchange on the external surfaces and edges of Zn–Al–SO 4 LDHs, but possibly some topotactic exchange may occur through the substitution of arsenic anions with sulfate in the interlayer region.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Layered Double Hydroxides Synthesis and Applications · Arsenic contamination and mitigation · Chemical Synthesis and Characterization
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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